book Maths Puzzle Numerical Ability

The vertices of a right triangle are (-12,8), (24,8), and (24,-7). Find the lenght of the hypotenuse of the triangle.

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book Other Question

Convert the measure, round your number to the nearest tenth.

65 lb/ft cubed to kg/L (1 kg is about 2.205 lb; 1ft cubed is about 28.3L)
I cannot understand how to preform this
I'm trying to answer a question and that is what are the similarities between radical and rational exponent notation. I know they both use the same properties...but I feel like I'm